After some insignificant shifts in March, the Liberals have overtaken the Tories in April:

Angus Reid (April 21-22, n = 1000 online)
CPC 33%
Lib 33%
NDP 15%
BQ 10%
Green 6%

Harris Decima (April 8-19, n = 2000)
CPC 29%
Lib 32%
NDP 16%
BQ 9%
Green 11%

Ekos (April 8-15, n = 1500 phone/online)
CPC 30%
Lib 37%
NDP 16%
BQ 9%
Green 8%

Strategic Counsel (April 2-5, n = 1000)
CPC 32%
Lib 34%
NDP 15%
BQ 10%
Green 9%

Leger (March 18-23, n = 1500)
Lib 35%
CPC 34%
NDP 14%
BQ 9%
Green 6%

MEAN (change since March in brackets)
CPC 31.8 (-2.6%)
Lib 34.0% (+1.2%)
NDP 15.2% (+1.0%)
BQ 9.4% (-0.2%)
Green 8.0% (-0.6%)

Also:

-In Manitoba, the NDP have a 10 point lead on the PCs.

-In BC, STV doesn’t look to be quite as sure a bet to pass as previously thought according to this Ipsos poll.